Financial risk management (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Financial risk management [Line Items]

Disclosure of maturity analysis for non-derivative financial liabilities [text block]

(e)

The long-term portion of the financial obligations held by the Group matures as follows:

	2018			2017
	US$(000)			US$(000)

Between 1 and 2 years		278,397			125,215
Between 2 and 5 years		266,625			427,680
		545,022			552,895
Debt issuance costs		(4,126	)		(3,803	)

		540,896			549,092

Sociedad Minera Cerro Verde S.A.A. [Member]

Disclosure Of Financial risk management [Line Items]

Disclosure of detailed information about foreign currency exchange rates risk [Text Block]

	Effect on profit before income tax
	US$(000)

December 31, 2018
10% increase in future copper prices		72,847
10% decrease in future copper prices		(72,847	)

	Effect on profit before income tax
	US$(000)

December 31, 2017
10% increase in future copper prices		83,955
10% decrease in future copper prices		(83,955	)

	Effect on profit before income tax
	US$(000)

December 31, 2016
10% increase in future copper prices		88,508
10% decrease in future copper prices		(88,508	)

Disclosure of maturity analysis for non-derivative financial liabilities [text block]

The following tables show the expected aging of maturity of the Company’s obligations, excluding taxes and accruals, as of December 31, 2018 and 2017:

	On demand		Less than 3 months		3 to 12 months		1 to 5 years		Total
	US$(000)		US$(000)		US$(000)		US$(000)		US$(000)

As of December 31, 2018
Trade accounts payable		-		231,080		56		-		231,136
Accounts payable - related parties		-		6,014		-		8,860		14,874
Other financial liabilities		-		-		-		1,022,810		1,022,810
Provision related to benefits to employees		-		24,300		18,269		32,509		75,078
Other accounts payable		-		7,472		93,782		215,070		316,324

Total		-		268,866		112,107		1,279,249		1,660,222

As of December 31, 2017
Trade accounts payable		-		194,890		68		-		194,958
Accounts payable - related parties		-		5,534		-		8,147		13,681
Other financial liabilities		-		-		-		1,268,488		1,268,488
Provision related to benefits to employees		-		64,339		16,406		29,158		109,903
Other accounts payable		-		3,374		36,808		33,424		73,606

Total		-		268,137		53,282		1,339,217		1,660,636